Improvement in centrifugal pumps



To all ivlwm 'it may concern;

n. L .E B -B` o F CHAR L Es TIG/uson TH e Ain o L I N A.-

VVLettere.Patent` No.' 97' ,6`55', dated December y7, 1869.

mrovnmm' IN CENTRIIGAL PUMPS.

l Be it known tbatl, N. H. LEBBY, of 4Charleston','`

in the ydistriotoflCharleston, and Stateof South Oar# 'olina, have invented certain new yand useful Improvement-s iii/'Centrifugal Pumpsg-and I do hereby-declare thatthe following is aiull, clear, and exact de se-ri-p'tion thereof, reference being had to `the -gaecompanying drawings,` v

*in whichl y Figure 1 represents asideelevation, and

Figure 2,'a longitudinal section' -of my centrifugal "And to this end, lis consistsLm' the=eonstruotion of -a chamber on the wheel, opposite theinduotion, vsubstantially in the .ina-nner andl for-the purpose liereinatfterspecied. v '.lo enable others skilled in the. artto ywhich' my inventionj appertan's," to makeand vuse the same, Iv will` now deseribeits construction and operation.

In the-- aocompanyin g :drawings- Pliepre'seuts they pnmp-wheehwnleli lisformed on.

its back side, that is, the Yside opposite the induction, with one or more' tonguesa a', which` yrevolvefreelyin andaronnd 4 and4 tothe' letters ofreference. vmarkedthereon, which form a partof this speeioatioinand;

` the correspondinggrooves and tongues l1 l), formed on the plate B, that oovers the wheel.

T.he 'circularehalnber C, formed by these grooves and tongues, is opposite the induction D, and -isoi the same' diameter.

y The chamber 'C communicates with the hollow .ou l

the opposite' side of the wheel I", through the openings 0, iu the wheel P, and the area of these openings O is large, comparedV with the area of leakage between the'tongues audgrooves'a b, so that a small pressure inthe chamber. G," will discharge as much water through the openings O,v as the pressure, due to the height to which thewater is raised, can force to leak between the tongues and grooves a b, into the' chamber C. -By t-hsxarrangeinent of a chamber on the side of the pump-wheel, opposite the induction, an equal press- L ure on both sides'of'the wheel is obtained.

Having thus'fully described my invention, That Iclaim as new, and ldesire to seoure by Letters Patent, is-

' The openings O, in the back of the wheel P, in combination with tongues and groovesa b, on the back of the wheel P, and on the platel, substantially iu the manner andfor the purpose specifiedl `In testimony that I claim the foregoing as my own, I afiix my signature, in presence ot' two witnesses. 5 N. II. LEBBY.

Witnesses:

JNo. E. RIVERS,

A. J. BURKE. 

